I’m surprised that the crosstalk at LF is as high as that. I can’t be specific about resistors, the problem is always errors on the input gain pot. The problem is that the tracks are never quite the same so if there is minimal crosstalk at one position of the pot, if you move the pot just a little then the crosstalk could be very much worse. There is also a problem of mechanical ‘backlash’; moving the pot a tiny amount could move the slider on one of the tracks but there might be some sloppiness so that the movement of the other wiper is not quite the same….. same effect, poor crosstalk performance. I always advise against running completely different signals on the two sides. The only real answer is to change the input gain pot; but new ones are generally just as bad! 😥
